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P.m. eastern, meet the scientists investigating whether bats could hold the secret to covid-19. heres a preview. >> in a lab nearly 6,500 miles from wuhan, researchers in berkeley, california, are looking to bats to find clues on how to help humans fight coronaviruses like covid-19. >> i think in a way theres actually a lot we can learn from bats. this group of animals has been around for millions of years. how can we look at their history with viruses and take that knowledge and think about the...

>> in an ecosystem, what role do bats have? >> yes. theyre a really critical, key component. for instance, insect eating bats, because they consume so many insects, they play a large role in controlling insect bomb lagss. >> a normal size bat can eat up to 500 to 1,000 mosquitos in an hour that might be carrying diseases like zika or malaria. if youre in an area where there are a lot of bats at night, you should be thankful for those bats. >> exactly. >> and that trags lats into big money for ag...

All the same ecological roles that birds do, only they do it at night. >> bats are unique mammals. though structurally in some ways theyre similar to humans. >> so bats have four limbs. two of them are taxed to the wings. >> two of them are the wings. yes. they have all the same bones. the upper article, the forearms, the wrist bones, and then the bones that support the end of the wing are long finger and hand bones. >> bats living and eating habits vary widely across the 4121 species that exist...

Bats throughout human history seem to have this image

A very small subset of horseshoe bats all named for the shape of their noses. there are actually dozens of varieties of horseshoe bats living in a number places, including the temperate regions of africa, asia and europe. in fact theres incredible variety among bat species. they can be found all around the world and every continent except antarctica. however, the unique abilities of bats makes them tough to contends with when it comes to disease. theyre the only mammal capable of actually flying...

When covid-19 first surfaced at the end of 2019, scientists wanted to know where it came from and how this deadly virus ended up in humans. although answers are not certain, it seems likely the coronavirus originated in bats. bats are diverse and ancient creatures and theyve been on earth longer than we have. despite that, there is still a lot we dont know. tonight we take a look at this enigmatic animal and dig into the mystery of covid-19. in the last 20 years, some of the deadliest virus outb...

People do as well. we carry viruses, bacteria, the majority are benign or beneficial, some of which cause disease. it is the fact bats do tends to carry a higher proportion of virus thats have the ability to infect people. the question is really, why do we see some of these incredibly bad viruses coming out of bats? >> it was 7:00 p.m. on december 30th, 2019. when a package arrived at the wu han institute of virology. in it, medical samples from an infectious disease hospital. several patients w...

Educational subjects, and to get peoples fears reversed. >> when the wing is around the face like that, theyre using their wings as ability-in blanket. >> he is part of a larger ools movement that has been taking place in the last three decades teaching people why they should be protected. not feared. >> were all here for one purpose and one target and one direction. thats to help these animals. to help people understand why they need our assistance. theyre so much like us. they are different lo...

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Bats. sars, ebola. so what is it about these creatures and the way they spread pathogens that can be so dangerous? >> the fact that bats are carrying viruses is not in and of itself extraordinary. every animal has its normal suite of viruses and bacteria. we carry back tier ateria. bats tend to carry a higher amount of viruses that have the ability to infect people. the question is really, why do we see some of these incredibly bad viruses coming out of bats? >> the special report airs tonight a...